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Re: dying hosta

I believe Southern Blight and Crown Rot are 2 different pathogens.  The 
symptoms I have observed of SB, are the leaves fall over beginning at 
the perimeter of the plant and work inward, until all have fallen over 
and are lying flat on the ground.  Removing a leaf it looks rotted at 
the base and is mushy.  There appears to be a white powdery substance at 
the base and the mustard seed spores are evident.
	Crown Rot the leaves brown beginning at the edges and move rapidly down 
the leaf toward the petiole.  The leaves may still remain upright, but 
if you pull them off they pull away easily and are also mushy and have 
an odor.  Incidently the symptoms I have experienced of heat dormancy 
are similar, but the leaves don't pull away easliy and there is no odor.
	At the AHS convention I asked Bob Solberg what to use for SB.  He 
suggested the bleach solution and as an alternative, terrachlor, a 
	At the Midwest Copnvention in July, I got in a discussion with Mark 
Zilis and Gerry Hadrava about CR.  Gerry said he uses a combination of 
fungicides.  He mixes them together to create a broad spectrum product.  
In other words if one doesn't work, the others will.  Bleach was also 
suggested, but the fungicide was prefered.  Sorry but I can't remember 
the fungicieds Gerry uses.  They were common named fungicides that are 
readily available.
	I had a mature plant of Collosal, 2 feet high and 5 feet wide,  3 years 
ago that exibited signs of crown rot.  I tried powdered sulphur, then 
bleach when it appeared the sulphur wasn't working.  Finally the plant 
withered to nothing.  It was gone in one season.  I removed the rotted 
crowns, and drenched the soil with more bleach and a fungicide.  I 
didn't replant until this year.  It has spread into other plants in the 
area.  I have treated with a fungicide every 2 weeks all season.  It 
seems to have halted the spread.
	I had SB on a Mountain Snow several years ago.  It did not kill the 
plant like the CR did.  The SB only stunted it and made it look bad the 
rest of the season.
	Needless to say I have more respect for these diseases.  If I suspect 
anything, I get out the arsinal.  Incidentally the fungicides and bleach 
are poured directly ovetr the crown of the plant and surrounding soil.  
A thourough drenching.
Tom Micheletti
The Hosta Patch
Deer Park, IL
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